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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional
electrostatic transducer, and FIG. 2 is a block diagram showing an embodiment of the
electrostatic transducer according to the present invention. 21 ° 22
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
transducer), and more particularly, to an improvement of a diaphragm (a town pole) suitable for
a push-pull type using a pair of electrets having opposite charges. About. Recently, electrets tend
to be used for rounding that can be dispensed with using a single power source in electrostatic
shadow transducers used for speakers and the like. FIG. 1 shows a conventional electrostatic
transducer unit note constructed in a dew's bowl using such an electret, and in this case, a
diaphragm (a movable plate (a movable member) formed by observing a gold plated thin film
112. 113 on each side. A pair of fixed poles 12 ° 13 consisting of electrets 121 and 132 having
positive and negative different sign charges with each other with an equal gap g on both sides of
the pole 11 is paired. The following electrostatic transducer is configured as described above,
and the pair of fixed electrodes 12.13 and the diaphragm (movable &) 11 are appropriately
connected to a signal line (not shown), and the potential of the diaphragm (movable electrode) U
is neutral It will be used as a point or ground point. However, in this case, assuming that the
diaphragm (movable electrode) 1 contacts the fixed electrode 13 consisting of the electret 132
on the positive charge side due to the pressure change rate generated inside the unit, the positive
charge of the electret 132 is 5 '] The so-called end face leaks to the neutral point or the ground
through one entire thin film 113 of the moving electrode), so that the potential of the fixed
electrode 13 formed by the electret 132 of positive charge even drops, It had the disadvantage
that it was not possible to make a small lance-like operation peculiar to the formula, and the
stability was lowered. Therefore, the present invention has been made in view of the above
points, and the diaphragm (movable wedge) is improved so as to be able to remove the above-
mentioned conventional defects simply and surely, thereby achieving high stability. The purpose
is to provide a 靜 1 type transducer. An embodiment of the present invention will be described in
detail with reference to the drawings. That is, as shown in FIG. W2, a pair of electret fixed poles
21 and 22 which are made to have positive and negative different sign charges each other as
shown in W2 are disposed in parallel with a predetermined distance. Then, a diaphragm (a
movable plate) is disposed at the central portion between the electret internal test 21.22 having a
pair of positive and negative different sign charges so that the gaps 7'd on both sides are
substantially equal. Here, the diaphragm (town work pole) XS has a surface facing the electret
fixed electrode 21 of the load as the metal thin film portion Oit body 23 and a surface facing the
positive electret fixed electrode 22 on the impact side. Is a dielectric material 232 such as a bird
molecule thin film, and the conductor 231 and the it body 232 are integrated together so as to
be back to back.
The Samurai-type transformer configured as above has electret fixed poles 21 and 22 and a
diaphragm (movable! JJ is appropriately connected to a signal line (not shown), and the potential
of the diaphragm (movable tank) 23 is used as a neutral point or a ground point. By the way, in
this case, for example, the diaphragm (movable tank) 2! The movable plate (movable tank) 2!
Since the surface of the west side is formed of a dielectric 232 such as a high density film #, etc.,
the end face leakage as in the prior art is not brought about, so that the potential of the electret
fixed pole 22 on the positive charge side drops. However, it is possible to stably maintain a
balanced and low distortion operation having a Buti-Shul type. Although the above description
has been made of the Butsshugle type using a pair of positive and negative electret fixed poles
different in sign from the real tI / Afll # 'i, this applies to a pair of electret fixed poles having
charges of the same sign. The present invention can be applied to the same effect to those of the
single type or other single type, as long as an electret fixed pole having at least one positive
charge is used. Therefore, as described in detail above, according to this invention, the stability is
improved as much as possible by improving the diaphragm (i'il active pole) so as to simplify and
reliably remove the conventional defects. It is possible to provide an electrostatic transducer that
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